[Eeglablist] question for overlapping in Spectopo()

#SHAN XIN# SHAN0055 at e.ntu.edu.sg
Wed Aug 5 10:29:14 PDT 2015

Dear Arno,

Since it says [integer], does this imply that if I want to have a 50% overlap, I need to pass "'overlap',50" instead of "'overlap', 0.5" to the function? Or other number format?

Shan Xin

Arnaud Delorme <adelorme at noetic.org<mailto:adelorme at noetic.org>> ? 2015?8?6? 01:12 ???

Dear Makoto,

Yes this is what it means.


On Aug 5, 2015, at 10:03 AM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu<mailto:mmiyakoshi at ucsd.edu>> wrote:

Dear Arno,

>  'overlap'  = [integer] window overlap in data points {default: 0}

Does this mean by default there is not overlap in spectopo()? I guess it uses windowing function. Windowing with no overlap?


On Wed, Aug 5, 2015 at 3:10 AM, #SHAN XIN# <SHAN0055 at e.ntu.edu.sg<mailto:SHAN0055 at e.ntu.edu.sg>> wrote:

Dear Makoto,

There were some discussions  in archives about overlapping for Spectopo(), but no confirmation was reached. So I hope to ask this again:

The pwelch() function in Matlab has a default overlapping of 50%. But Spectopo(), which uses pwelch() function, has the following description in help file:

    'overlap'  = [integer] window overlap in data points {default: 0}

So in the end do we need to pass the overlap value pair to Spectopo()?

Thank you!
Shan Xin

Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego

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